<script setup lang="ts">
// Interactive reseller margin calculator. Margin is PROGRESSIVE (like tax
// brackets): the first 500 users earn 15%, users 501–1000 earn 30%, and every
// user beyond 1000 earns 40% — all off the 49 kr/user/mo list price. The
// per-bracket rates come from the tier copy so they never drift.
import { ref, computed } from 'vue'
import { useTheme, useCopy, useLang } from '~/composables/useLanding'

const t = useTheme()
const copy = useCopy()
const lang = useLang()
const c = computed(() => copy.value.pages.partners.calc)

const LIST_PRICE = 49 // DKK per user per month

const seats = ref(600)

const nf = computed(() => new Intl.NumberFormat(lang.value === 'en' ? 'en-US' : 'da-DK'))

// Progressive brackets. `lo`/`hi` are the user-count bounds; pct is read from
// the matching tier so the calculator and tier cards stay in sync.
const brackets = computed(() => {
  const items = copy.value.pages.partners.tiers.items
  const f = nf.value
  return [
    { lo: 0, hi: 500, pct: parseInt(String(items[0][2]), 10) || 0, label: `0–${f.format(500)}` },
    { lo: 500, hi: 1000, pct: parseInt(String(items[1][2]), 10) || 0, label: `${f.format(501)}–${f.format(1000)}` },
    { lo: 1000, hi: Infinity, pct: parseInt(String(items[2][2]), 10) || 0, label: `${f.format(1001)}+` },
  ]
})

function usersIn(b: { lo: number, hi: number }) {
  return Math.max(0, Math.min(seats.value, b.hi) - b.lo)
}

const monthly = computed(() =>
  Math.round(brackets.value.reduce((sum, b) => sum + usersIn(b) * LIST_PRICE * (b.pct / 100), 0)),
)
const annual = computed(() => monthly.value * 12)

const dkk = new Intl.NumberFormat('da-DK', { style: 'currency', currency: 'DKK', maximumFractionDigits: 0 })
const fmtMonthly = computed(() => dkk.format(monthly.value))
const fmtAnnual = computed(() => dkk.format(annual.value))

// Expose theme border color to scoped CSS via v-bind() so media-query-driven
// border direction changes (left on desktop, top on mobile) can still use the
// reactive theme value without window reads.
const borderColor = computed(() => t.value.border)
</script>

<template>
  <div class="calc-grid" :style="{ display: 'grid', gap: '0', border: `1px solid ${t.border}`, borderRadius: '4px', overflow: 'hidden' }">
    <!-- Controls -->
    <div :style="{ padding: '36px', background: t.surface, display: 'flex', flexDirection: 'column', gap: '28px', justifyContent: 'center' }">
      <div>
        <div :style="{ display: 'flex', justifyContent: 'space-between', alignItems: 'baseline', marginBottom: '12px' }">
          <span :style="{ fontFamily: '\'JetBrains Mono\', monospace', fontSize: '11px', color: t.fgMuted, letterSpacing: '0.06em', textTransform: 'uppercase' }">{{ c.seatsLabel }}</span>
          <span :style="{ fontFamily: '\'Inter Tight\', sans-serif', fontWeight: 600, fontSize: '20px', color: t.fg }">{{ nf.format(seats) }}</span>
        </div>
        <input v-model.number="seats" type="range" min="10" max="2000" step="10" :style="{ width: '100%', accentColor: t.signal, cursor: 'pointer' }" >
      </div>

      <!-- Progressive bracket breakdown -->
      <div>
        <div :style="{ fontFamily: '\'JetBrains Mono\', monospace', fontSize: '11px', color: t.fgMuted, letterSpacing: '0.06em', textTransform: 'uppercase', marginBottom: '14px' }">{{ c.marginLabel }}</div>
        <div :style="{ display: 'flex', flexDirection: 'column', gap: '10px' }">
          <div
            v-for="(b, i) in brackets" :key="i"
            :style="{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', opacity: usersIn(b) > 0 ? 1 : 0.4 }"
          >
            <span :style="{ display: 'flex', alignItems: 'center', gap: '9px', fontFamily: '\'JetBrains Mono\', monospace', fontSize: '12px', color: t.fg }">
              <span :style="{ width: '5px', height: '5px', borderRadius: '999px', background: usersIn(b) > 0 ? t.signal : t.fgDim }" />
              {{ b.label }}
            </span>
            <span :style="{ fontFamily: '\'Inter Tight\', sans-serif', fontWeight: 600, fontSize: '15px', color: t.fg }">{{ b.pct }} %</span>
          </div>
        </div>
      </div>
    </div>

    <!-- Output -->
    <div class="calc-output" :style="{ padding: '36px', background: t.bgAlt, display: 'flex', flexDirection: 'column', justifyContent: 'center' }">
      <div :style="{ fontFamily: '\'JetBrains Mono\', monospace', fontSize: '11px', color: t.fgMuted, letterSpacing: '0.08em', textTransform: 'uppercase' }">{{ c.monthlyLabel }}</div>
      <div :style="{ fontFamily: '\'Inter Tight\', sans-serif', fontWeight: 600, fontSize: 'clamp(40px, 5vw, 60px)', letterSpacing: '-0.03em', lineHeight: 1.0, color: t.fg, marginTop: '8px' }">{{ fmtMonthly }}</div>
      <div :style="{ marginTop: '20px', paddingTop: '20px', borderTop: `1px solid ${t.border}`, fontFamily: '\'Inter\', sans-serif', fontSize: '15px', color: t.fgMuted }">
        {{ c.annualLabel }} <span :style="{ color: t.fg, fontWeight: 600 }">{{ fmtAnnual }}</span>
      </div>
    </div>
  </div>
</template>

<style scoped>
/* Desktop: two equal columns; output panel has a left divider. */
.calc-grid {
  grid-template-columns: 1fr 1fr;
}
.calc-output {
  border-left: 1px solid v-bind(borderColor);
}

/* Mobile: stack to single column; swap left divider to a top divider. */
@media (max-width: 768px) {
  .calc-grid {
    grid-template-columns: 1fr;
  }
  .calc-output {
    border-left: none;
    border-top: 1px solid v-bind(borderColor);
  }
}
</style>
